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Re:In Urban China, Cash Is Rapidly Becoming Obsolete by dragonwriter on Tuesday July 18, 2017 @10:12AM (#14796625)
Even when that was true (which, as a sibling comment notes, it is not anymore), it was common anyway.
Re:In Urban China, Cash Is Rapidly Becoming Obsolete by DrScump on Tuesday July 18, 2017 @05:48PM (#14800324)
The statute says:

"(3) NO RESTRICTIONS ON SETTING TRANSACTION MINIMUMS OR MAXIMUMS.–A payment card network shall not, directly or through any agent, processor, or licensed member of the network, by contract, requirement, condition, penalty, or otherwise, inhibit the ability of any person to set a minimum or maximum dollar value for the acceptance by that person of any form of payment.”

It does not inhibit state or local jurisdictions from banning merchants from setting card minimums in their individual credit card consumer transactions.